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@gleiten gratte latent @titre SAMUEL GISSINGER, OF LAWRENGEVILLE, PENNSYLVANIA.

, Letters Patent .Na-68,870, dated September 17, 1867.

IMPRQVED TOOL-HOLDER FOR TURNINGIATHES.

TO ALL WHOM I'l- MAY GONCERN:

Beit known that I, SAMUEL GISSINGER, oi"4 Lawrenceville, in the county of Allegheny, and State of Pennsylvania, have invented a new and useful Improvement in Tool-Holder for Turning-Lathes; :tud I do hereby declare that the following is a. fullzmd exact description thereof, reference being had to the accompanying drawing, and to the letters of reference marked thereon.'

The nature of my invention consists in an arrangement of an endless screw, wheels, screws, and nuts, combined with a. pivoted leaf, which supports the turning-tool, the whole being constructed, arranged, und operating in the manner hereinafter described. y

To enable others skilled in the art to make and use my inventiOn,-I will proceed to describe its construction andoperotion. In the accompanying drawing- Figure l represents a. longitudinal section of my improved tool-holder cut through at line w 'o f fig-3.

Figure 2 represents an end elevation of the same.

Figure 3 represents e transverse section Of the same cut through a line, x', of fig. 1.

The box A is made in the form represented in the drawing, and is secured. to the slide-rest of theluthe. The lettil B, which supports the turning-tool, is pivoted ut the point marked e,ras 'shown in figs. 1 and 2. lhe socketf, for the turning-tool h, is held in a. dove-tnil groove in. the leaf B by the part marked o,`a.nd by the set-screw g forcing the tool h down on the washer z'. The endless screw n is placed on the shaft s, und gearsinto the wheels m on the screws c, which have their lower bearings inl the bottom of the box- A, and their upper ends work in the long screw-nuts y, the top sides of' which are made round and fitted in recesses in the under side ofthe leaf B, and move in grooves, Q, made in the sides of the box'A.

As the skilful mechanic will reodilyunderstand the construction and arrangement of my improved toolholder by reference to the accompanying drawing, without further description, I will at once proceed to describe its operation, which is as follows: Byturning the crank .Ithe'endless screwot will be revolved, and the revolving of it will revolve the wheels m, which will force up one of the vnuts y and draw down the other'. Thus by turn-` ing the crank J inone direction the turning-tool is raised, andV by turning the crank in another direction it is lowered. A

' Having thus described the nature, construction, and operation of my improvement, what I claim as of my invention, is-

The pivoted leaf B, when used in combination with the nuts y, screws c, armed with wheels m, said wheels, screws, and nuts being operated through the medium of the endless screw n, the whole being arranged, combined, and operating substantially in thermanner and for the purpose herein described and set forth;

' SAMUEL GISSINGER.

Witnesses: i

JAMES J. JOHNSTON, GEO. H. THOMAS. 

